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Old 11-10-2012, 02:15 AM   #1
davidb21 OP
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Is there any danger in getting close to redline?

I have a 04 klr 250, i get off work at around 1am and ive noticed my bike really loves the cold air at night so ive been racing around town a little before i get home each night...my redline is at 9.5k rpm and i'll regularly see that im doing 8k-9k in my 6th gear (only in 6th, i shift at around 7k in my other gears)

I never hold it at that high rpms for more than a minute or so but is there any danger in going that close to redline?
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Old 11-10-2012, 02:20 AM   #2
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No problem with running it through the gears and touching the redline or near there every once in a while. Holding it next to redline or at the limiter isn't so good, but nothing wrong with keeping the revs moderately up for power. Shoot, my CBR used to cruise the freeways at 7k all day long. With the previous owner's Yosh pipe, it was quite obnoxious.
If you're near redline in 6th, you might want to consider gearing up to bring the revs down a little.
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Old 11-10-2012, 04:08 AM   #3
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What Buickid said.

I get close to or hit redline all the time on my KLR650. But I try to keep the revs below 5,500 on the interstate. I put on a one tooth larger front sprocket.
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Old 11-18-2012, 02:37 PM   #4
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Originally Posted by B.Curvin View Post
What Buickid said.

I get close to or hit redline all the time on my KLR650. But I try to keep the revs below 5,500 on the interstate. I put on a one tooth larger front sprocket.
Don't you want one one tooth smaller? more tire rotation per rev.
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Old 11-20-2012, 06:06 AM   #5
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Originally Posted by B.Curvin View Post
What Buickid said.

I get close to or hit redline all the time on my KLR650. But I try to keep the revs below 5,500 on the interstate. I put on a one tooth larger front sprocket.

Quote:
Originally Posted by gmk999 View Post
Don't you want one one tooth smaller? more tire rotation per rev.

If you want to lower RPMs at a given speed, smaller in the rear or bigger in the front.
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Old 11-10-2012, 04:56 AM   #6
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The only motorcycle that I ever cruised sustained right on Redline was powered by the BMW type 247 boxer air-cooled engine. BMW built engines capable of this.

Wouldn't try it with any lesser engines.
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Old 11-10-2012, 06:59 AM   #7
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Originally Posted by vortexau View Post
The only motorcycle that I ever cruised sustained right on Redline was powered by the BMW type 247 boxer air-cooled engine. BMW built engines capable of this.

Wouldn't try it with any lesser engines.
Yeah, Riiiight...

Any modern engine will run pretty close to all day long at near redline. Most, if not all, have limiters that kick in before any damage is done.

Of two current bikes:
R1200, I can't see running up against the redline because it just isn't necessary (although I have hit the limiter a time or two)
TW200, I run that little sucker flat out ALL the time with no ill effects.

Gerg
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Old 11-11-2012, 04:59 AM   #8
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Originally Posted by Gerg View Post
Yeah, Riiiight...

Any modern engine will run pretty close to all day long at near redline. Most, if not all, have limiters that kick in before any damage is done.

Of two current bikes:
R1200, I can't see running up against the redline because it just isn't necessary (although I have hit the limiter a time or two)
TW200, I run that little sucker flat out ALL the time with no ill effects.

Gerg
Near redline? I'm talking of right on redline, or past it.

120mph for twenty miles on a R75/6 with American (R60/6) final ratio, and mph speedo back when Oz was already metric.
I did slow down to 110mph at the occasional wooden plank bridge, then open back up to 120.



Like this but with S90-type fairing and slim panniers.



Bridge surfaces like this taken at 110mph.
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Old 11-12-2012, 08:04 PM   #9
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Question Total Beknackt

Quote:
Originally Posted by Gerg View Post
Yeah, Riiiight...

Any modern engine will run pretty close to all day long at near redline.

Gerg
Quote:
Originally Posted by bush pilot View Post
German junk is so overrated!


You ought to read some of the batshit crazy talk over at RB Racing...

Those guys are seriously whack.

http://www.rbracing-rsr.com/bmwturbos.htm



"We get asked all the time about what should be done to prepare your BMW for turbocharging...Well, this depends on what your goals are. Before we get into this we should give you a brief rundown on what you already have. If your bike was a Honda it would be superbly engineered and every part would be optimized for performance and reliability at the oem designed rated horsepower...double that figure and the rods, clutches and pistons are past their limits. BMW does things a bit differently. They build it to run for 300 hours non stop at 2.5 to 3 times the rated horsepower, then they cut things by 2/3 and sell it to you. The rods, pistons, cranks and base engine drivetrains are overly engineered on most of the models. The exception to this is the early air cooled models which started out as low horsepower, low rpm engines that weren't tested at 150 to 200 hp. Early K100's are practically bulletproof as they start out with 70 hp and at 125hp turbocharged they will run forever. We pumped them out to 312hp and never had a crankshaft problem although at rpms approaching 12000 they would float their valves and break camshafts."




































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DOGSROOT screwed with this post 11-12-2012 at 08:09 PM
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Old 11-16-2012, 10:10 AM   #10
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Quote:
Originally Posted by Gerg View Post
Yeah, Riiiight...

Any modern engine will run pretty close to all day long at near redline. Most, if not all, have limiters that kick in before any damage is done.

Of two current bikes:
R1200, I can't see running up against the redline because it just isn't necessary (although I have hit the limiter a time or two)
TW200, I run that little sucker flat out ALL the time with no ill effects.

Gerg
Thanks,you said it for me. "only a mighty air cooled beemer is tough enough for the feared redline"
A manufacturer puts that redline where it wants,they build the engine and tune it. If it cant rev to redline regularly theres something wrong.
Ive seen what happens when a airhead is spun a little too hard.
Not much worth saving usually.
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Old 11-10-2012, 07:01 AM   #11
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It's fine with a few caveats:

Keep it maintained; keep the oil fresh, chain at the right spec, valves adjusted correctly, etc.

Don't go near redline or use heavy throttle until the bike has had adequate time to warm up! This varies from bike to bike, but you want the OIL to be warmed up -- not just the coolant (if applicable) Ride easy right after you get going and slowly ramp up the agressiveness.

Boucning off the rev limiter itself repeatedly puts huge stresses on all the engine components because either fuel or ignition is being cut to keep the engine from overrevving.
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Old 11-10-2012, 12:33 PM   #12
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Quote:
Originally Posted by vortexau View Post
The only motorcycle that I ever cruised sustained right on Redline was powered by the BMW type 247 boxer air-cooled engine. BMW built engines capable of this.

Wouldn't try it with any lesser engines.
I spun a rod bearing on my old R90S doing just that, sustained high speed crossing the high desert in NM...German junk is so overrated!
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Old 11-10-2012, 01:21 PM   #13
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Quote:
Originally Posted by vortexau View Post
The only motorcycle that I ever cruised sustained right on Redline was powered by the BMW type 247 boxer air-cooled engine. BMW built engines capable of this.

Wouldn't try it with any lesser engines.
Comedy GOLD!! You sir know how to make subtle joke!
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Old 11-10-2012, 03:46 PM   #14
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Comedy GOLD!! You sir know how to make subtle joke!
Ohhh, NOW I get it! THAT's FUNNY!

Yes, he is a supergenius!
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Old 11-10-2012, 07:35 AM   #15
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Touching on what Buickid said. If your capable of hitting redline in 6th, that tells us that your bike has been geared up for tighter trail-off road type use. If your using it mainly for commuting duty, you could save on gas and general engine wear and tear by lowering the final ratio a bit.
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